Prothane motor mount problem - Team Camaro Tech
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post #1 of 17 (permalink) Old Aug 19th, 08, 04:43 PM Thread Starter
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Kevin
 
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Prothane motor mount problem

Here's what I have: ZZ/4 350, Prothane motor mounts # 69074 and NPD frame mounts C-0029-4AP. I can't get the engine to "sit down" on these frame mounts. Take a look at the photos and you can see what my problem is. I even removed the mounts from the engine and tried to mate them up to the frame mounts, but no luck. The polyurethane material is hitting the frame mount preventing the bolt from being able to be run through the holes. Anyone else running this combo? What frame mounts are you using?



I took these pictures without moving the engine between shots. Kevin
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post #2 of 17 (permalink) Old Aug 19th, 08, 06:59 PM
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Tom
 
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Talking Re: Prothane motor mount problem

I am not familiar with the prothane mounts or what NPD's frame brackets are. What year is your car ? What frame mounts were used ? What engine mounts are used ? Don't tell me small block, because there are more than just small block mounts. I would recommend '69 302/350 frame mounts and the tall and narrow ('69) engine mounts. From the pictures I am guessing that you have the short and wide engine mounts (67-68) and not the tall and narrow of 1969.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #3 of 17 (permalink) Old Aug 20th, 08, 05:46 AM
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Rick
 
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Re: Prothane motor mount problem

I suspect the fitment issue is with the repro stands. I had the same issues and went back to original frame stands - everything fit fine then.

Rick Dorion
69 RS Conv therapy program, Autogear M22, 8-pt cage, with a new 410! SOLD
New therapy program - 68 Coupe. Will be survivor exterior, modern underpinnings! SOLD
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post #4 of 17 (permalink) Old Aug 20th, 08, 06:22 AM
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Derek
 
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Re: Prothane motor mount problem

I know from measuring that some engine mounts (using original GM, repro rubber and/or polyurethane) and reproduction frame stands can be "snug" when new, and unfortunately there are not any original GM frame stands available directly from GM anymore (most have been discontinued for a while). NPD sells Energy Suspension and they are about .03" narrower between the mounting "ears" versus the original rubber or repro rubber mounts.

Derek

Project Manager, National Parts Depot

1970 Chevy Nova
-BBC, Procharger and wheelies
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post #5 of 17 (permalink) Old Aug 20th, 08, 06:47 AM Thread Starter
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Kevin
 
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Re: Prothane motor mount problem

My car is a '69, the frame mounts are for a 302,350 according to NPD. The engine mounts were part of prothane's 7-2002 kit, the only number I have is the 69074 that is stamped on it. I'm converting over from a six to the ZZ/4, so I don't have the original frame mounts. I called Prothane yesterday, but was sent to voice mail and haven't got a call back yet .
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post #6 of 17 (permalink) Old Aug 20th, 08, 07:59 AM
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Rick
 
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Re: Prothane motor mount problem

I got my repros to bolt up by grinding out the bolt holes. Maybe some stands will show up on ebay or in the classified.

Rick Dorion
69 RS Conv therapy program, Autogear M22, 8-pt cage, with a new 410! SOLD
New therapy program - 68 Coupe. Will be survivor exterior, modern underpinnings! SOLD
67 Belair with perfect floors, pinchwelds and firewall. Hmmm!
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post #7 of 17 (permalink) Old Aug 20th, 08, 09:54 AM
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Matt
 
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Re: Prothane motor mount problem

I have an original set of v-8 frame brackets off the frame. I can measure them and give you the dim's if you want. Can't sell them as they are going back on the car.

Also keep in mind the aftermarket motor mounts don't take into account the spread when the weight of the motor is on them. This is the problem with most solid motormounts like Moroso or Mr G.

'68 Camaro SS. Dealer for American made performance & restoration parts.
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post #8 of 17 (permalink) Old Aug 20th, 08, 10:24 AM Thread Starter
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Kevin
 
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Re: Prothane motor mount problem

Quote:
Originally Posted by chassisboy View Post
I have an original set of v-8 frame brackets off the frame. I can measure them and give you the dim's if you want.
I'd appreciate that . I talked to NPD, they are sending me a different mount to try. I'll have it tomorow afternoon. Kevin
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post #9 of 17 (permalink) Old Aug 21st, 08, 08:11 AM
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Matt
 
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Re: Prothane motor mount problem

I didn't forget about you. I am looking for the mounts in my disaster of a garage. Somebody moved them but no one remembers where!

'68 Camaro SS. Dealer for American made performance & restoration parts.
Check my site
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post #10 of 17 (permalink) Old Aug 21st, 08, 10:16 AM Thread Starter
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Kevin
 
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Re: Prothane motor mount problem

Quote:
Originally Posted by chassisboy View Post
I didn't forget about you. I am looking for the mounts in my disaster of a garage. Somebody moved them but no one remembers where!
Sounds familiar T.S Fay is parked just about right over our head, so I'm getting lots of other things done these last three days.
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post #11 of 17 (permalink) Old Aug 21st, 08, 12:37 PM
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Don
 
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Re: Prothane motor mount problem

If it helps, I used the Energy Suspension 3.114 short wide mounts on my stock 302-350 towers, bolts basically fall in place.

Don
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #12 of 17 (permalink) Old Aug 21st, 08, 05:59 PM
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Matt
 
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Re: Prothane motor mount problem

Can't find the mounts (idiots!!!!!) But I did find theis link in the archives from Pozzi. This has the dims for the frame and engine mounts. http://www.pozziracing.com/camaro_engine.htm

'68 Camaro SS. Dealer for American made performance & restoration parts.
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post #13 of 17 (permalink) Old Aug 21st, 08, 08:13 PM
 
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Smile Re: Prothane motor mount problem

I have all poly under my 496 on NOS BB frame mounts and after it was all said and done w/, I wished that I would have bought new NOS '67 6-banger/350SS motor rip apart rubber mounts up front and just drilled them, countersunk one side and bolted them together w/ Grade-8 stuff like I did back then before the GM MM recall letter came out!!

I say all this b/c they sit like at least 3/8" lower than the new poly mounts do which would give me my much needed like a 1/2" hood clearance and they would be locked together so they CAN'T come apart!!

pdq67



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post #14 of 17 (permalink) Old Aug 22nd, 08, 05:47 AM
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Matt
 
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Re: Prothane motor mount problem

Thats why my car has a motorplate!

'68 Camaro SS. Dealer for American made performance & restoration parts.
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post #15 of 17 (permalink) Old Aug 22nd, 08, 07:32 AM
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Bret
 
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Re: Prothane motor mount problem

Quote:
Originally Posted by kcart55 View Post
I'm converting over from a six to the ZZ/4, so I don't have the original frame mounts.
My car was originally a 6 and converted to to a SB 327 when I bought it. Based upon the overall condition of the car and trhe way things were done by previous owners, I can almost guarantee that the frame stands were not swapped out. Perhaps you can make your 6 cyl mounts work too?

Bret Copsey
'68 Camaro base coupe
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